I wasn't going to get into this one, but:

In reply to:

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I know where they buy their deep frozen pre-cooked fries and visited the factory that produces them.

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I've been to a factory (somewhere near Peterborough?) that makes fries for some of the UK burger chains, and yes, they are made by slicing spuds. Different blade spacings for different customers, and careful matching of crop availability (variety, age, etc.). More to it than you'd think, and they're still crap compared to the chip shop on the corner .